The domain entered in you cloud(s) settings needs to match an Infoblox zone. To add a domain to your cloud(s)

Under Infrastructure - Clouds, edit your cloud settings

In the domain field, enter your domain

In v2.9.x and prior, the domain field is at the top of the Cloud Config modal.
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In v2.10, the domain field is under Advanced Settings in the Cloud Config modal.
.. image:: /images/administration/infoblox-976bd.png

In v2.10.1 and later, a Domains section has been added in the Infrastructure -> Networks Section, and there is now a Domain dropdown to select a domain from the Networks section in the Cloud Config modal.

Once the Infoblox integration has been configured, while provisioning you can now select networks that have the Network Pools added, and the name of the Infoblox IP Pool will populate to the right of the selected network:

The during provisioning, your instance IP will be assigned by Infoblox: